> The 3com docs indicate the board only does 4 byte dma- 
> though the card is a 64 bit unit, its plugged 
> into the backplane via a 32 bit connector. 

Check REQ64#, ACK64#, and the byte enable signals (C/BE# 4-7) to see if either the card or bridge is getting confused about whether the transactions are 64 bit or 32 bit.
It almost sounds like one of the bridges is getting confused about how to translate between 32 bit and 64 bit devices.

-- Chris Caudle


